Performance analysis of the ‘d’ explosion-flameproof enclosure type of protection for electrical equipment used in hazardous explosion areas

In many industries such as petrochemicals, natural gas extraction, food, and pharmaceuticals, potentially explosive atmospheres can occur due to the presence of flammable gases, vapours, or combustible dust. These environments require the adoption of rigorous safety measures to prevent explosions and protect personnel and infrastructure. Explosion protection is regulated at the European level by the ATEX Directive 2014/34/EU and a series of international standards, such as the IEC/EN 60079 series. Equipment used in these environments must be designed so that it does not become a source of ignition. One of the most widespread and effective types of protection is protection by means of a flameproof enclosure, marked with the Ex d symbol. This involves enclosing the electrical components in an enclosure capable of withstanding an internal explosion and preventing its propagation into the environment. The purpose of this paper is to analyse the performance of the Ex d protection type from a constructive, functional, and application point of view. The paper will address the operating principles, design criteria, equipment testing, and concrete applications in industry. This analysis aims to highlight the essential role of Ex d protection in the current context of industrial safety and to identify the limitations or challenges associated with the use of this type of protection.